president obama visited wounded troops at walter reid medical center. >>> washington, d.c. is remembering 9/11 and the people who died with several events. this morning, mary visited some of the fire stations that sent firefighters to the pentagon. thanked him for their service and served them breakfast. city leaders and government workers performed an afternoon of service for veterans and first responders down at freedom plaza. >> the city of frederick, maryland, is honoring the victims of september 11 with a special flag. that flag was donated by the daughters of the american revolution and the red, white, and blue flags have images of the twin towers, the pentagon, and the cracked liberty bell. that flag will fly in front of city hall all week long. >> today, a local hospital is marking this anniversary by making sure its staff members are ready in the event of another major emergency. it is simulating both buy logical and natural disasters all for the purposes of training. >> i'm andrea mccarren at southern maryland hospital center in clinton where staff members are mem